{"id":3563,"date":"2023-10-05T11:31:56","date_gmt":"2023-10-05T11:31:56","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=3563"},"modified":"2023-10-05T11:32:40","modified_gmt":"2023-10-05T11:32:40","slug":"week-10-ss2-third-term-physics-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-10-ss2-third-term-physics-notes\/","title":{"rendered":"Week 10 – SS2 Third Term Physics Notes"},"content":{"rendered":"

WEEK TEN
\n<\/strong>Contents:
\n<\/strong>Vibrations in strings
\nVibrations produced in closed pipes
\nVibrations produced in open pipes<\/p>\n

\u00a0Vibration in strings<\/strong>
\n\t\tWaves travels aloog a horizontal rope fixed at one end, and the other end is free to move. Sound wave is generated from a fixed string that is allowed to move at the other end. In this mode of vibration the vibrating wire produces a sound of the lowest possible note whose frequecy is called fundamental frequency. The mode of vibration is giving rise to the fundamental mode of vibration. <\/p>\n

\u00a0The distance between the two consecutive mode is \u039b\/2 and this is equal to the lenght of the string l.
\nL = \u039b\/2 or \u039b = 2l
\nFor any wave we have that v = f\u039b where v is the velocity, f, the frequency, and \u039b the wavelenght.<\/p>\n

\u00a0Vibrations produced in closed pipes.
\n<\/strong>In a closed pipe, only odd numbers of harmonics are present as overtones accompanying the fundamental note. The possible harmonics are f\u043e <\/sub> , 3f\u043e , 5f\u043e , 7f\u043e etc.
\nWhere f\u043e = fundamental frequency. fo<\/sub> = v\/4l<\/p>\n

\u00a0Vibrations produced in open pipes
\n<\/strong>In an open pipe the harmonics present are 2f\u043e, 3f\u043e, 4f\u043e,5f\u043e etc. , thet is, both odd and even harmonics are present as overtones. fo<\/sub> = v\/2l<\/p>\n

\u00a0EVALUATION
\n<\/strong>1. The shortest lenght of the air column in a resonance tube closed at one end which resonates to a frequency of 560Hz is found to be 20cm. What is the wavelenght of this sound in air?
\n2. Determine the frequency of the first overtone of a closed pipe of lenght 30cm, if the end correction is 0.8cm and the velocity of sound is 340m\/s.<\/p>\n

\u00a0General revision
\n<\/strong>1. An electric heater immersed in some water raises the temperature of the water from 400<\/sup>C to 1000<\/sup>C in 6min. After another 25min, it is noticed that half the water has boiled away. Ignoring heat lost to the surrounding, calculate the specific latent heat of vaporisation of water.
\n2. The image of an object is located 6cm behind a convex mirror. If its magnification is 0.6, calculate the focal length of the mirror.<\/p>\n

\u00a0WEEKEND ASSIGNMENT
\n<\/strong>1 \u00a0The natural frequency of a simple pendulum depends only on
\n\u00a0\u00a0\u00a0\u00a0A area B amplitude C length D speed
\n2\u00a0 A tuning fork sounds louder when its stem is pressed against a table top than when held in \u00a0\u00a0\u00a0air because
\n\u00a0\u00a0A. a larger mass of air is set vibrating by the table top B. the whole table vibrates in resonance
\n\u00a0\u00a0C. the whole table has acquire a larger frequency D. the fork and the table have the same \u00a0\u00a0\u00a0\u00a0frequency
\n3 What type of motion does the skin of a talking drum perform when it is being struck with \u00a0\u00a0\u00a0\u00a0drumstick\u00a0\u00a0\u00a0\u00a0A. random B. rotational C. vibratory D. translational
\n4 \u00a0\u00a0Which of the following statement is not true
\n\u00a0\u00a0\u00a0\u00a0A. musical notes consists of combination of sounds of regular frequency
\n\u00a0\u00a0\u00a0\u00a0B. sound travels faster in solids than in gases
\n\u00a0\u00a0\u00a0\u00a0C. the loudness of sound is determine by its frequency
\n\u00a0\u00a0\u00a0\u00a0D. the pitch of a note depend on the frequency of vibration of the source
\n5 Calculate the wavelength of a note which is one octave lower than a note of 256 Hz in a \u00a0\u00a0\u00a0medium in which the speed of sound is 352m\/s A. 0.69m B. 1.38m C . 2.75m D. 5.50m<\/p>\n

\u00a0THEORY
\n<\/strong>1 What do you understand by the term resonance?
\n2 An object 5cm high is placed at a distance of 12cm from a convex lens of focal length 8cm, calculate the position and nature of the image produced.<\/p>\n

\u00a0Reading Assignment
\n<\/strong>New School Physics Pages 336 – 342<\/p>\n","protected":false},"excerpt":{"rendered":"

WEEK TEN Contents: Vibrations in strings Vibrations produced in closed pipes Vibrations produced in open…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,279],"tags":[],"class_list":["post-3563","post","type-post","status-publish","format-standard","hentry","category-posts","category-third-term-ss2-physics"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3563","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/comments?post=3563"}],"version-history":[{"count":1,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3563\/revisions"}],"predecessor-version":[{"id":3564,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3563\/revisions\/3564"}],"wp:attachment":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/media?parent=3563"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/categories?post=3563"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/tags?post=3563"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}